The Gewehr 1891 was the last variation on the 1888 Commission rifle. It incorporated improvements for feeding from strippers IIRC. It is similar to the Argentine 1891 rifle. Your has been modified to be a single shot, from what you say, not uncommon before WW1 for rifles used for hunting.

What is it chambered for? That would be a wild guess. You will have to have the chamber cast and determine what the chambering is from Cartridges Of The World or a similar reference. There were a nmber of fairly popular (at that time) small-bore cartridges it could be chambered for.

Scorch, the Argentine 1891 was a Mauser design, the Gew 91 was part of the '88 series and is not.
As for this Gew 91, if (and that's a big if) it's still in it's original caliber it would be in 8x57 I (with the smaller .318 barrel).

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I used to love being able to hit hard at 1000 yards. As I get older I find hitting a mini ram at 200 yards with the 22 oddly more satisfying.

That's not a proof mark but a military acceptance stamp. Proof marks weren't introduced until 1892, so it's unclear if your rifle has any. I would take the barrel out of the stock and look underneath. I would also take off that scope mount on the front of the receiver, it covers the area where you would usually see markings.

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I used to love being able to hit hard at 1000 yards. As I get older I find hitting a mini ram at 200 yards with the 22 oddly more satisfying.

The Gew 91 and the 1891 Mauser are two entirely different rifles. Look at the photos and compare them to an 1891 Mauser and you'll see what I mean. The Gew 91 was only produced in a carbine version. The Gew 91 is basically a Kar 88 with a stacking hook added and was intended for artillery and transportation units.

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